Mahathir, himself a blogger, said society had access to blogs, a medium which he said was "almost beyond the control of any authority", and that if bloggers were ethical and write the truth, more people would make blogs their source of information.
If bloggers adhered to these ethics, he said, "I think eventually people will come to respect blogs."
"If we are not saying the truth, people will desert blogs like (how they desert) the ordinary media today," he said in his keynote address at the Asian Bloggers and Social Media Conference 2010, here today.
The two-day conference, themed "Reflections of the Social Media Revolution", is organised by My Events International and is attended by about 400 people across Asia.
Mahathir said although bloggers were free to blog what they want, they should do so in a responsible manner and not abuse the medium.
"(Bloggers) should not say nasty things or curse people; don't do that because people will get annoyed and they can take action against you," he said, adding that "even if we don't like a person, we should not say things which are not true (about that person)".
Mahathir, who runs a popular blog at http://chedet.co.cc/chedetblog/, said it was imperative for bloggers to be able to back what they say.
He said that although bloggers had the advantage in terms of freedom, they must make use of the freedom to shape the opinion towards building a better world community and for the betterment of the people.
"No one can stop or correct you because you are in charge; you are the writer, the editor and the publisher... when you have the weapons, don't use it indiscriminately. Bloggers must always exercise restraint and avoid anything that is not true and things that hurt people," he said.
Mahathir said while some blogs were very good, there were others which were "worthless" and that certain skills were needed to sort out blogs which reported the truth from those that contained mere propaganda.
"Problems arise because there are so much news coming in; you get confused and when you get confused you make the wrong decision. So you have to sort out the news," he said.
Mahathir also said that the ordinary press would not be able to write everything because of space constraint.
He said that because of such constraint he turned to blog to provide him with the space to express his views.
Mahathir also said that his blog was being read by people from many countries, including from Israel.
If bloggers write with responsibility, they and their blogs would become popular, he added.